如何將三個路由器連接到 mininet 中的三個主機？

Question

我有這段代碼，我試圖用它來將三個路由器 r1、r2、r3 連接在一起。 我想我必須使用交換機將主機節點連接到路由器，以便每個路由器都連接到連接到主機的交換機。 我讓它適用於 2 個路由器，但我無法讓它適用於三個路由器我正在使用 mininet 運行 python 腳本。 有沒有辦法將 ip 地址添加到主機的路由表中。 我是 mininet 的新手，所以我不熟悉連接路由器。 我必須為 7 個路由器執行此操作，而不僅僅是三個，但我現在從 3 個開始。 有一個更好的方法嗎？

#!/usr/bin/python
from mininet.topo import Topo
from mininet.net import Mininet
from mininet.node import Node
from mininet.log import setLogLevel, info
from mininet.cli import CLI


class LinuxRouter(Node):
    def config(self, **params):
        super(LinuxRouter, self).config(**params)
        self.cmd('sysctl net.ipv4.ip_forward=1')

    def terminate(self):
        self.cmd('sysctl net.ipv4.ip_forward=0')
        super(LinuxRouter, self).terminate()


class NetworkTopo(Topo):
    def build(self, **_opts):
        # Add 2 routers in two different subnets
        r1 = self.addHost('r1', cls=LinuxRouter, ip='10.0.0.1/24')
        r2 = self.addHost('r2', cls=LinuxRouter, ip='10.1.0.1/24')
        r3 = self.addHost('r3', cls=LinuxRouter, ip='10.2.0.1/24')

        # Add 2 switches
        s1 = self.addSwitch('s1')
        s2 = self.addSwitch('s2')
        s3 = self.addSwitch('s3')

        # Add host-switch links in the same subnet
        self.addLink(s1,
                     r1,
                     intfName2='r1-eth1',
                     params2={'ip': '10.0.0.1/24'})

        self.addLink(s2,
                     r2,
                     intfName2='r2-eth1',
                     params2={'ip': '10.1.0.1/24'})
                     
        self.addLink(s3,
                     r3,
                     intfName2='r3-eth1',
                     params2={'ip': '10.2.0.1/24'})
        
        # Add router-router link in a new subnet for the router-router connection
        self.addLink(r1,
                     r2,
                     intfName1='r1-eth2',
                     intfName2='r2-eth2',
                     params1={'ip': '10.100.0.1/24'},
                     params2={'ip': '10.100.0.2/24'})
        
        self.addLink(r1,
                     r2,
                     intfName1='r1-eth3',
                     intfName2='r2-eth3',
                     params1={'ip': '10.101.0.1/24'},
                     params2={'ip': '10.101.0.2/24'})
     
        
        # Adding hosts specifying the default route
        d1 = self.addHost(name='d1',
                          ip='10.0.0.251/24',
                          defaultRoute='via 10.0.0.1')
        d2 = self.addHost(name='d2',
                          ip='10.1.0.252/24',
                          defaultRoute='via 10.1.0.1')
        d3 = self.addHost(name='d3',
                          ip='10.1.0.253/24',
                          defaultRoute='via 10.1.0.1')

        # Add host-switch links
        self.addLink(d1, s1)
        self.addLink(d2, s2)
        self.addLink(d3, s2)


def run():
    topo = NetworkTopo()
    net = Mininet(topo=topo)

    # Add routing for reaching networks that aren't directly connected
    print info(net['r1'].cmd("ip route add 10.1.0.0/24 via 10.100.0.2 dev r1-eth2"))
    print info(net['r2'].cmd("ip route add 10.0.0.0/24 via 10.100.0.1 dev r2-eth2"))

    net.start()
    CLI(net)
    net.stop()


if __name__ == '__main__':
    setLogLevel('info')
    run()

Answer 1

路由器3不工作的原因是因為你沒有連接它！ 所以而不是

self.addLink(r1,
                     r2,
                     intfName1='r1-eth3',
                     intfName2='r2-eth3',
                     params1={'ip': '10.101.0.1/24'},
                     params2={'ip': '10.101.0.2/24'})

利用

self.addLink(r1,
                     r2,
                     intfName1='r1-eth0',
                     intfName2='r3-eth0',
                     params1={'ip': '10.101.0.1/24'},
                     params2={'ip': '10.101.0.2/24'})